Automatic window-screen



W. SANDBERG.

AUTOMATIC WINDOW SCREEN.

APPLICATION FILED ocr. so, 1919.

Patented Feb. 3, 1920.

2 SHEETS-SHEET l- A RN Y ZZZ Y W. SANDBERG.

AUTOMATIC WINDOW SCREEN.

APPLICATION FILED OCT. 30. 1919.

1,829,999. Patented Feb. 1920.

2 SHEETS-SHEET 2.

i 7 g a w P i Fay/V 11 2 [la IFLDLLI 3 WITNESSES: I NVE/VTOR v film/mafia, Witt" fly f WALTER sannsnae, on PORTLAND, onneon.

AUTOMATIC winnow-sonnnn."

furnish a screen which makes it almost impossible for children to fall out of the window; second, to give the screen and its machinery a longer life by placing it inside the house; third, to provide a screen which can easily be separated from the sash, yet is.

always near at hand when required; fourth, to avoid the inconvenience attendant to screens which are attached to the outside of a house. v

I attain these objects with the mechanism shown in the accompanying drawing, in which Figure I is a front elevation of the lower part of a window as seen from the inside of the house, with the machinery properly incased; the construction on the right hand side, however, is'a modification of the one shown on the left hand side.

Fig. II is a section of Fig. I along the line aa, but with the protective casing omitted.

Fig. III is a section of Fig. I along the line b-Z disclosing fully the construction of the most essential parts.

Fig. IV is a section through Fig. I along the line cc, revealing a slight modification of the apparatus shown in Fig. II.

Similar numerals refer to similar parts throughout the several views.

Referring now particularly to Fig. III, we notice a window sash 1 of vertically-sliding construction resting on the window-sill 2 meshes, will make lateral motion of the Specification of Letters Patent. Patented. Feb, Application filed October 30,1919. Serial No. 334,453.

Since, however, the screen would not wind upon the roller of its own accord, I connect one or both ends of the large roller 10 with a train of gears 11', which latter tighten a spiral spring 12 whenever the screen is unwound. This spiral spring in turn will react and produce the necessary torsion on the large roller to wind the screen when the sash is lowered.

The protective casing over the gearing is indicated by the numeral 13.

A reference to Fig. II will fullyv illustrate any details of construrtion which are not obvious from the Fig. III alone; and it only remains to point out the modification pic torially represented in Fig. IV.

Here we find practically a repetition of every essential detail previously described, except that thetrain of gears 11 is not composed of spur gears only, but that one of them, preferably 11*, which carries the spiral spring 12, is a crown gear, so that this part of the gear may be located around a corner. This construction is desirable where the window sill is narrow and can not accommodate a full series of spur gears. In their effect upon the screen .5, however, both mechanisms are identical.

Numeral 14, it might be added, indicates the handles on the Z-bar, to lift the latter on and off the screws 7 on the sash 1.

Having thus described my invention, it will be seen that my objects have been accomplished, and, though I have shown the preferred form of construction, I reserve to myself the right to make any changes which do not violate the spirit and principle of my invention.

I claim:

11 In an automatic window screen, the combination of a window having a sill, a vertically sliding sash, and having a vertically grooved stop to guide said sash, with a wire screen disappearingly mounted on the window sill, having the upper end removably attached to the lower part of the sash and sliding with the, lateral edges within the vertical groove of said stops.

2. In an automati window screen, the

combination of a Window having a sill and a vertically, sliding sash, havin rooved stops to guide the interior face 0t t e sash, and having a plurality'of rowels extending into the grooves, with a windowso'reen disappearingly mounted on the Window sill, a

I 7 removable Z-bar to keep the Wire screen in slidingalineinent with the rooves in the stops, While the rowels enter into the lateral edges of said screen and prevent a disen- 10 ga ement of said edges from said grooves.

igned by me at Portland, Oregon, this;

24th day of October, 1919.

WALTER sANDBERe. 

